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Preparation method for lithium ion battery electrode material

A lithium-ion battery and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low conductivity, low ion diffusion coefficient, poor cycle stability, etc.

Inactive Publication Date: 2012-06-27
BEIJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Layered LiCoO 2 It has the advantages of mature preparation technology, good commercialization, and high capacity, but its safety is poor, which brings certain restrictions to its actual large-scale application; Mn-based spinel materials such as LiMn 2 o 4 It has the advantages of low cost, wide source of raw materials, environmental friendliness, good thermal stability, etc., but poor cycle stability and serious capacity fading; crystal LiFePO 4 With the advantages of good cycle stability, environmental friendliness, low cost, good safety, and moderate voltage, it has become the first choice for power batteries, but it has disadvantages such as low conductivity, low ion diffusion coefficient, and low density.

Method used

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  • Preparation method for lithium ion battery electrode material
  • Preparation method for lithium ion battery electrode material
  • Preparation method for lithium ion battery electrode material

Examples

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Embodiment 1

[0022] Synthesis process see figure 1 : first pass inert gas such as N into two parts of distilled water or deionized water 100ml 2 Or Ar to remove oxygen in water; weigh 94.01mg of Li according to the ratio of the amount of ionic species 1:1:1 3 C 6 h 5 o 7 4H 2 O, 2780.2 mg of FeSO 4 ·7H 2 O, 1320.6mg of (NH 4 ) 2 HPO 4 .

[0023] Li first 3 C 6 h 5 o 7 4H 2 Dissolve O in solution A, then FeSO 4·7H 2 O is dissolved in solution A; (NH 4 ) 2 HPO 4 Soluble in solution B; Fe in solution 2+ , Li + with PO 4 3- The ion concentration is 0.1mol / l, and finally the two solutions are sealed respectively. Use two clean syringes to extract liquid A and liquid B respectively, install them on the syringe pumps respectively, and press them with capillary and T-shaped connectors. figure 1 The method is connected, the end of the capillary in the reaction zone is connected to a closed receiving device, and the receiving device is connected to the air pressure bottle to...

Embodiment 2

[0025] Synthesis process see figure 1 And embodiment 1: first respectively to two parts (A, B liquid: Fe in the solution 2+ , Li + with PO 4 3- Ion concentration is 0.01mol / l) distilled water or deionized water 100ml into an inert gas such as N 2 Or Ar to remove oxygen in water; weigh 9.40 mg of Li according to the ratio of the amount of ionic species 1:1:1 3 C 6 h 5 o 7 4H 2 O, 278.02 mg of FeSO 4 ·7H 2 O, 132.06mg of (NH 4 ) 2 HPO 4 .

[0026] Li first 3 C 6 h 5 o 7 4H 2 Dissolve O in solution A, then FeSO 4 ·7H 2 O is dissolved in solution A; (NH 4 ) 2 HPO 4 Dissolve in solution B; finally seal the two solutions separately. Use two clean syringes to extract liquid A and liquid B respectively, and install them on the syringe pumps respectively. The adjustment parameters are as follows: heating temperature T=200°C, quartz capillary length 30cm inner diameter 250μm, additional pressure P=0Psi, liquid flow rate V =3ml / h, after drying, the amorphous phos...

Embodiment 3

[0028] Synthesis process see figure 1 And embodiment 1: first respectively to two parts (A, B liquid: Fe in the solution 2+ , Li + with PO 4 3- Ion concentration is 0.1mol / l) distilled water or deionized water 100ml into an inert gas such as N 2 or Ar to remove oxygen in water, then weigh 94.01mg of Li 3 C 6 h 5 o 7 4H 2 Dissolve O in solution A, then weigh 2780.2mg of FeSO 4 ·7H 2 O was dissolved in liquid A; additionally weighed 1320.6 mg of (NH 4 ) 2 HPO 4 Dissolve in solution B; finally seal the two solutions separately. Use two clean syringes to extract a certain amount of liquid A and liquid B respectively, and then install them on the syringe pumps respectively. The adjustment parameters are as follows: heating temperature T=200°C, quartz capillary length 30cm inner diameter 250μm, additional pressure P=200Psi, liquid flow rate respectively It is V=3ml / h, and the amorphous phosphate Fe-based positive electrode material is obtained after drying.

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Abstract

The invention discloses a preparation method for a lithium ion battery electrode material, belonging to the technical field of the lithium ion battery electrode material. The preparation method comprises the following steps of: adopting microfluidics for a primary or secondary structure, a solution containing Fe (2+) ion and Li(+) ion and a precursor solution containing PO43- ion; using an injector to respectively extract the solutions and then installing the injector on an injection pump; connecting the injector by a T-shaped connector, connecting the third end vertical end with a capillary tube as a reaction region (if the reaction region is a secondary structure, the reaction region is formed by connecting two primary structures in series and in parallel); and controlling such different parameters as the type of precursor solution salt, flow velocity of liquid, the additional pressure, the length and the inner diameter of the capillary, the solution concentration, the reaction temperature and the like to acquire amorphous phosphate Fe-based anode material. The prepared material is directly synthesized in a liquid phase by solid-liquid discharging without a subsequent thermal treatment, has high discharge specific capacity and cycling stability under a low multiplying power and a high multiplying power.

Description

technical field [0001] The invention relates to a preparation method of lithium-ion battery electrode materials, in particular, a new material synthesis method is used to prepare lithium-ion battery electrode materials, and a new type of lithium-ion battery amorphous phosphate Fe-based positive electrode material is successfully prepared for the first time , and can also be used in the preparation of other positive electrode materials and negative electrode materials for lithium ion batteries, and belongs to the technical field of lithium ion battery materials. Background technique [0002] Due to the reduction of fossil fuels and the resulting global environmental and climate problems, especially the development of new energy vehicles in recent years, people urgently need clean new energy with low cost and good safety. At present, lithium-ion batteries are considered as a new type of energy storage system with higher energy density to meet people's needs, provide power for ...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李正耀夏定国汪夏燕尚怀芳刘淑珍
Owner BEIJING UNIV OF TECH
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